ListIterator

Iterator 只能向前移动
ListIterator 却能双向移动

ListIterator.nextIndex()　　//得到下一个索引
ListIterator.previousIndex()　　//得到当前的索引
ListIterator.set()　　//替换最后一个访问的元素

public static void main(String[] args) {
// TODO Auto-generated method stub
List list = new ArrayList();
list.add("cat");
list.add("dog");
list.add("panda");
ListIterator listIterator = list.listIterator(1);    //从索引为1开始
while(listIterator.hasNext()){
String name =  (String)listIterator.next();
System.out.println(name + ",nextIndex:" + listIterator.nextIndex() +",previousIndex:"+listIterator.previousIndex());
listIterator.set(name + "set后");
}
listIterator = list.listIterator(1);    //从索引为1开始
while(listIterator.hasNext()){
String name =  (String)listIterator.next();
System.out.println(name);
}
}

//输出：
dog,nextIndex:2,previousIndex:1
panda,nextIndex:3,previousIndex:2
dogset后
pandaset后